Grinding-wheel truer for grinding-machines.



PATENTED MAR. 31, 1908. v

A. B. LANIDIS.

TRUER FOR GRINDING APPLICATION FILED MAY 8, 1906.

GRINDING WHEEL MAGHINES- s sums-slum 1.

GRINDINGWHEEL TRUER FOR GRINDING MA fiINEs.

3 S.HEETS-SHEET 3 7 APPLICATION FILED MAY 8, 1906.

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are combined ABRAHA'M'B. LANDIS,'OF WAYNESBQRO', rnnns-rrvnnu.

GRINDING-WHEEL moss FOB enrnnme-mncnmas.

. To tell whom'it may concern:

Be it known that I, A nlmnAivr-B. LANDIS, a citizen of the United States, residing at VVaynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Grinding- VVheel T ruers for Grinding-Maehines, of

. ,which the following is a specification...

In the use of grinding machines for grinding parts having rounded corners, such journals and crank-shafts with shoulders at one or both ends, it is necessary to have the corners of'the grinding wheel rounded to con form to the shape of the corner to be ground and to keep the face and corners of said wheel properly dressed in order that perfect results may be secured.

My present invention is more particularly desi ned for truing the grinding wheel when set? for grinding the wrist or crank-pins of ank-shalts forengines, in which the shafts I a d wrist are in one piece and said cranks are quently in multiple. As each wrist must be supported by a separate, rest-and it being undesirable to remove said wrist from the.

machines and the grinding-wheel away from the point of rest of the wrist-pin, it becomes ,desirable to mount said truing deviceupon the wrist ltseli.

. My said invention consists, therefore, in the. construction "and arrangement of parts whereby a, work-rest and diamonding tool to enable these results to be accom lished, all as will be hereinafter more fully escribed and claimed.

Referring to the accompanying drawings which are made a art hereof and on which similar reference'c aracters indicate similar arts, Figure 1 is-a side elevation of a combined work rest and diamsnding tool ombodying my said invention, Fig. 2 a similar View wlth parts shown in section to more clearly illustrate the construction, Fig. 3 a top or plan view, Fig. 4a section to one of the work rests, Fig; 5 a detailed section through the holder for the diamond tool, and Fig. 6 an end elevation thereof as on dotted line 6-6 in Fig. 2.

In said drawings the portions marked .A

I represent the'base or frame of the work rest part A.

Specification of Letters Patent.

Patented a1, 1908.

n ncaaoiijmea Maylfl, 1906. Serial No. 315,775.

of the mechanism. Its top is preferably inclined as shown, and provided with a groove orway in which a tongueorrib b on the under. face of'the frame B is mounted.

The frame B is of appropriate form to support the diamonding tool and is mounted upon the top of said frame A, as just described, being secured in the desired 1011 itudinal adjustment on said frame A means of clamping bolts b passin through slots in depending flanges on the si es of said frame B and engaging with screw-threaded perforations in the. upper end of said frame A, being thus adapted to clamp said flanges between the heads of said bolts and the adjacent faces-of said frame. a

The work rest proper comprises a block A having a point a inits outer end of appropriate material to bear against the work. ai

block is mounted in 'a horizontal perforation in the base or frame A directly behind the axis of the work and is formed with a socket in its rear end. A screw-threaded sleeve 0. is mounted in a screw-threaded perforation in theopposite side of frame A and is adapted to extend to within said socket. A c01led s' ring a is interposed between the end of said s eeve 0; and the inner end of the socket in said part A. By this means the work rest may be held. yieldingly to the work and the tension of the spring a? may be adjusted as desired by adjusting said sleeve a ,.as will be readily understood. Said sleeve av is internally screw-threaded and a screw rod a. is mounted therein with 1ts inner end a extending through the coiled spring 0. and adapted,

when properly adjusted, to rest against the inner end of the socket .in the part'A. By this means, said part A may be held un yieldingly to the work, when desired, by ad justing said screwa to bring the end at into position to take the thrust of said art A off the, springa A flat portion is ormedon the upper side of part A and a cross-bar a mounted in a transverse perforation in the l frame A is adapted to rest thereon and a set- 'i screwi-ct is mounted upon said cross-bar with 1 1ts lower end adapted to impinge against 1ts upper side and hold it firmly clamped to the By forcing said set-screw a downpro er, B the frame of the diarnonding tool l wardly, said r-oller a may be made to impinge an C.the diamonding tool.

The frame A is formed to be mounted upon the Work holding table ot the grinding matightly upon said part A looking it against motion or vibration.

and thus aid in The rest for the underside of the WorkNV comehine and secured in the usual manner and of rise {an arm A mounted on a ivot t in a appropriate form to support the other parts i suitable recess inthe front of the frame A,

adjusted to suit work of any hav' a block a on its upper end of suitable material to bear against the work and an arm a projecting downwardly from the pivot into position to rest against the inner end of a i screw-rod A mounted in a transverse screwthreaded perforation extending through the base or frame A. By adjusting said screwrod said pivoted arm may be raised or lowered to raise or lower the bearing block a as Will be readily understood. By this arrangement' a work rest is provided which may be size and may be quickly and conveniently made either a yielding or a fixed rest, as desired. The ase-plate B of frame B is formed with a wide forward end between the sides I) of which is formed a segmental'track to afford a support for the lower end of the diamond tool frame.

The diamond tool C is, in itself, of any appropriate construction consisting of the diamond mounted in a suitable head which is supported in a shank (1, which shank is mounted eccentrically in a sleeve or bushing in a transverse bearing formed or mounted on the lower end of a spindle C", which is I mounted in a vertical bearingin the forward end of the over-hanging arm of the frame B. The up er end of said spindle C is'provided with a fever c by which it may be adjusted or turned as desired. Said frame (J is prefer'ably-formed with an intermediate cut c having a flange or arm on each side thereof and secured together by means of an adjusting screw a mounted in a scrmr-threaded perforation in one arm and another adjusting screw 0 mounted in a screw-threaded perforation in the other arm and extending to within a screw-threaded perforation in said screw 0 in the other arm. By this means a slight variation in the alinement of arm maybe secured by springing it one way or the other throng the operation of said screws, as will be readily understood. 'The spindle C is screw-threaded in the sleeve (J and is locked in the desired longitudinal adjustment by means of a jam-nut c. Said seen. ,a stud on which is ournaled an anti-friesleeve is locked in the desired circumferen tial adjustment by means of a set-screw c mounted in the lower end of the frame (2 and adapted to impinge at its inner end in a circumferential groove 0 in said sleeve. By this means said sleeve may be rotated to bring the diamond point directly in line with the axis of the spindle (3, as will be readily In the lower end of arm C is mounted ltion roller 0' which is adapted to travel on lthe segmental track formed in the front end (if-the lower plate B of the frame B. The lower end of said arm is thus firmly and rigidly supported against the thrustof the grinding wheel.

"In operation, the grinding wheel to be dressed is moved back and forth across the l l l projections b..

diamond from one side to the other andat the corners the tool is swung on its pivot C by means of theflever c to dress off the corner of the wheel of such a curve as may be required by the character of the work it is to erform. When not in use the clamping olts b may be released and the frame B slid back on the top of the frame A until said tool will be entirely out of the way of the work. Or, it may beremoved entirely from 7 the work rest in the case of grinding crank wrists in order to have the crank escape the When used for dressing straight faces with square corners the tool may be locked in position with its point at right angles with the surface being dressed by pins 0 which are inserted in perforations b and bear against faces formed on the side of lever c. When the sides of the wheel are to be dressed back from its face the tool is set in a position at right angles with that shown in Figs. 1 and 2 and locked by placing the pins 0 in'the appropriate holes 0. llaving thus fully described my said invention, what 1 claim as new and desire to secure by Letters Patent, is

l. The combination, with a grinding machine, of a tool for dressing the grinding wheel comprising a supporting frame, a pivoted frame mounted to swivel in said supporting frame, a diamond tool mounted in said pivoted frame in position to operate upon the face of the grinding wheel, the upper end of said frame being mounted in an overhanging support and its lower end su orted by bearing upon a track behind tl ie fine of its axis, substantially as set forth.

2. 'lhe combination, with a grinding machine, of a work-rest mounted upon the work supporting table, a supporting frame mounted upon the top of .said work rest formed. with its uppercnd overhanging its lowerportion, a frame journaled at its upper end In a bearing in said overhangim part and having its lower end formed to extendbehind the axis of its journal and having a rollerjournalcd on said lov. er end adapted to bear on a segmental track on said frame, and 'a diamond tool mounted in said frame, substantially as set forth.

3. In a machine for dressing the grinding surfaces of the grinding wheels of grinding machines, the combination of an overhanging frame or support suitably mounted adjacent to said grinding wheel, a frame carrying 1.20 the diamond tool .journaled at its uppbr end in said overhanging frame and so )ported at its low er end by ascgmcntal truck behind the axis of the journal, said diamond toolecccntrically mounted in a rotary sleeve or bush- 135 ing and means for adjusting said sleeve or bushing circ-nmfercntially, and securing it as desired, substantially as set forth.

4. in a diamond tool for dressing the faces of grinding wheels, the combination of a, sup-.130

porting frame comprising an overhanging part, a diamond carrying frame Journaled at its upper end in a bearing in sa d overhanging part and its lower end supported bya se mental track behind the axis of said supporting frame, comprising an overhangmg part, a frame carrying a diamond tool journaled in said overhanging part, said diamond tool being mounted upon a suitable screw-threaded stem mounted eccentrically in a sleeve or'busl'iing in the lower end of said frame and means for 'ad" usting said sleeve or bushing ciroun'iferentially and securing it in adjusted position, substantially as set forth.

6. In a diamond tool for dressinggrinding wheels, the combination of a supportim frame, a frame for carrying a diamond too l swiveled in said supporting frame; means for locking said frame to hold the point of a diamond in fixed relation to the face being dressed, and a lever for rotating said frame on its axis to carry said tool through the arc of a circle,-substantially as set forth.

7. In a diamond tool for dressing grinding wheel surfaces, the combination, of a supporting frame mounted on a grinding machine table, said supporting frame comprising an overhanging part, a frame for carrying a diamond journaled at its upper end in a bearing in said 'overhangin part and provided with a lever for swive ing it back and forth, means for looking it in fixed position,

an antiefriction roller on the lower end of said frame behind the axis of said journal, and a segmental track on the supporting frame against which said anti-friction roller bears,

substantially as set forth.

In witness whereof, I, have hereimto set my hand and seal at Waynesboro, PGIIIISYI". Vania, this 30th day of April, A. D. nineteen hundred and six.

ABRAHAM B. LANDIS. [L. s] Witnesses:

MERTA RUssELL, ALF. N. RUssELL. 

